Fuel feed burner



Feb. 18, 1936.

H. s. LEE 2,031,048

FUEL FEED BURNER Filed June 23, 1952 2 Sheets-Sheet 1 INVENTOR.

Ha ry )5. L; ee

ATTORNE Y5.

H. 5. LEE 2,031,048

FUEL FEED BURNER Filed June 25, 1932 2 Sheets-Sheet 2 \&

INVENTOR.

Harry 5- Lee ATTORNEYS.

I Patented Feb. 18, 1936 FUEL FEED BURNER i Harry S. Lee, Detroit, Mich.

Application June 23, 1932, Serial No. 618,836

8 Claims.

My invention relates to improvements in a fuel feed burner particularly adapted for use with cement clinker kilns and is shown as embodied in a burner adapted to feed powdered fuel to a rotary cement kiln, though the invention is obviously adaptable to any suitable type burner appliance of the same general character.

An object is to provide a fuel feed burner capable of feeding powdered fuel into a cement kiln and adapted to create and maintain a controlled combustion capable of being directed as desired into the cement kiln.

Another object is the provision of a fuel feed burner capable of delivering powdered fuel in an 5 air stream into a combustion zone supplied with air heated to produce combustion substantially upon contact with the fuel and wherein the heated air is caused to pass into a combustion zone over the discharge pipe for the powdered fuel and wherein such fuel discharge pipe is capable of adjustable positioning with respect 'tosuch combustion zone.

Another object is to provide an insulating layer of cooling air constantly passed over the fuel feed pipe to protect the same from heated air in the combustion zone whereby pre-ignition of the fuel in the said pipe is prevented,

Another object is the provision of a burner of this type wherein there is provided a fuel feed pipe and an encircling outer air pipe. The feed pipe communicates with a suitable source of powdered fuel and the airpipe communicates with a suitable supply of air. These pipes are telescopically arranged and one of the pipes is longitudinally adjustable with respect to the other so that the discharge ends of the pipes may be varied with respect to each other. In the particular embodiment illustrated in Figs. 1 and 2 both pipes pass through the wall of an enclosure 0 which forms an insulated combustion chamber about the pipes and into which they discarge and wherein combustion commences, which chamber itself discharges into a cement kiln. The two pipes are angularly adjustable as a unit within said chamber and the outer pipe provides an air passageway about the inner pipe protectively insulating the same from the heated air blast driven through the chamber from another source.

50 The outer pipe is adjustable lengthwise with respect to the inner pipe and is provided with a valve to control the admission of air therethrough.

Other objects and meritorious features of my ofiinvention will more fully appear from the following description, appended claims, and. ac-' companying drawings, wherein: I

Fig. 1 is a side elevation partly broken away showing my invention embodied in cement man.-

ufacturing apparatus, 5

Fig. 2 is an enlarged sectional view through my improved burner,

Fig. 3 is a sectional view taken on line 33 of. Fig. 2.

In the assembly view shown in Fig. 1, I0 inJ- ,10'

dicates a conventional rotary cement kiln except for the improvement represented in my instant invention. The construction of Fig. 1 is gen-. erally similar to that illustrated in my application Ser. No, 592,774, filed February 13, 1932. 15"" Cement forming aggregate is deposited into the rotary kiln ID to flow therethrough toward the,

, discharge end of the kiln, the kiln being supform no necessary part of this invention. {this 30 directed through the grate over which the drag chain travels and through the drag chain into the compartments from a plurality of air discharge V outlets 24 and this air, after passing through the clinker and performing its desired function, is 35 discharged from the forward compartment through passageway 26. It is discharged from the rear compartment through passageway 28.

Air is also taken from a jacketed portion 29. surrounding the chamber 14, as shown in the 00- pending application Serial No. 592,774, through. an air conduit 30 to a blower 32. The blower is adapted to direct the air through the fuel feed pipe 34 as a direct feed for the fuel which is discharged into the pipe through a spout 36 which communicates therewith as shown in Fig. 1.

The air which is discharged through the passageway 26 has passed through the heated clinkers or. the drag chain and is therefore very highly heated air. This air enters the enclosure 38 which surrounds the discharge end of the fuel feed pipe. and within this enclosure or, as it is termed in the trade, bustle it picks up the powdered fuel and I the fuel and air enter the kiln. The sources of air for the blower and for the passageway 26 are shown as originating in the cooling chamber l4. These sources of air form no necessary part of this invention and it is obvious that other sources of air for the fuel feed mechanism could be satisfactorily used.

My invention is directed to the fuel feed apparatus and it will be noted that the enclosure 38 is lined with suitable refractory material 40 and discharges directly into the open end of the kiln. The air pipe 26 discharges from one side into the enclosure: opposite the fuel feedtpipe. The fuel feed pipe shown in Fig. 1 is provided with a plurality of joints 42 which permit angular adjustment of the pipe. The fuel feed pipe passes through the wall of the enclosure 38 ascshownxpipe.26.- Themair. whichenters. through-the pipe 26 is very highly heated, that is, heated toa. point where combustion occurs. substantially. instantaneously upon the air striking the fuel feed stream. Thesecondary pipe 46.therefore serves to .insulatethe .fuelfeed. pipeso thatpre-ignitionof ithefuelwill not. occur. within the. fuel feed pipe... This secondary. pipe is slidably adjustable through v.thewallrof the enclosure so. as-to vary the. relativeposition of the dischargeend of the secondary pipewith respecttothe dischargeend of. .the fuel-feed. pipe; Aithreaded adjustment is shown.- which-is. operable. to accomplish this' function- A valve member 52- has a. sleeve portion 54;which..encircles the fuel feed pipe 34 as shown :in Fig. 2-.and the sleeve portion is provided with an angularlyextending slot 56 within which ishpositionedaipin 58 carried by the fuel feed pipesothatrotation .of this sleeve valve'element moves the-radially extending portion 52.. ofthe valve toward or away-=from.=the open end 48 of the sec-- ondary air pipe 46 and thereby controls the;

amount of. air-permitted to'enter the pipe 46.

Asupport isprovided for the fuel feed pipe and theseconda-ryair-pipe in the form of a bracket- 60.;secured by bolts.62 to-the end of the enclosure. Ihe.bolts.li2.ha.ve-play through-the endof the enclosure and there are provided two. tapered rings.64f. and. 61L which. are. arranged between the bracket. or. ring. 60. and-the end. of the enclosure and which .upon rotation tilt the tubular extension B'Ijofthering orbracketfi!) and through this .tilting tilt the. feed pipe. 3.4. and the. secondary air. pipe.

as. shown inFig. l so that the fuel blast may be directed as desiredto the. kiln.v This tiltingis. for the purpose. of directing. thefuel blast as desired into. the kiln.

I claim:

LFuel feed mechanism for a cement kiln.

comprising, in combination with a kiln, a. fuel.

feed pipe arranged to direct. astream of powdered.

fuel into-the kiln, a.source of heatedair, an enclosure surrounding. the discharge end of. said fuel. feed. pipe forming a chamber. thereabout communicating with the source of heated air to receive air therefrom to passthrough said chamberover. thedischarge end. of the fuel feed. pipe into.the.kiln, an air pipe extending. through the wall. of the enclosure. telescopically. surrounding thefuelfeedpipe but spacedtherefrom forming an air passageway therearound, and means supporting said pipes operable to adjust the angular position thereof as a unit within the enclosure.

2. Fuel feed mechanism for a cement kiln comprising, in combination with a kiln, a fuel feed pipe arranged to direct a stream of powdered fuel into the kiln, a source of heated air, an enclosure open at one end to the kiln surrounding the discharge end of said fuel feed pipe forminga chamber. thereabout communicating with thesource of heated air to receive .air therefrom to pass through said chamber over the discharge end of the fuel feed pipe into the kiln, an air pipe extending through the wall of the enclosure telescopically surrounding the fuel feed pipe but spaced therefrom forming an air passageway therearound, means supporting said pipes operable to adjust the angular position thereof as a unit within the enclosure, and means coupled with" one of said pipes and operable to move the H same=endwisewith respect to the other pipe.

3;.Fuel feed mechanism for a. cement kiln.

comprising, incombination with a kiln,. afuel. feed pipe arranged to. direct a stream of powdered. fuel into the kiln, a source of. heated. air,. an. enclosure. openat. one end to thekiln surround-v ing the discharge end of said fuel feedpipe form: ing a.-chamber thereabout communicating with the source of heatedair to receive. air therefrom to pass-through said chamber over. the. discharge end of the fuelfeed pipe-into the kiln, anair pipe extending through the wall of the enclosure telescopically surrounding the 7 fuel. feed pipe but spaced therefrom forming an air passageway therearound, means supporting saidpipes operable-to adjust the angular position thereofas a. unit within the enclosure, meanscontrolling the. admission: of air. into-said air pipe,.and,me.ans. engaging said. air pipe. operable. to. advance or withdraw. the. samewithrespect. to the. saidfuel' feedpipe.

4. In combination, a cement kiln, an enclosure forming a. chamber communicating, at one end with. oneendof thekiln, .a fuel .feedpipe extend: ing through said enclosure adapted.to..di.s. hargev into the kiln, an air. pipeoflargerdiameter than.

the fuel feed pipe extending throughsaidlencloe sure surrounding the. fuel feed pipe in. spaced relationship therewith, a source of. heate.c1;air,. means for delivering heated air. from said. source. into said enclosureforwardof the. dischargeends.

of, the fuel feed pipe and air pipe, means support.-

ing. said fuel feed pipe and air pipe operableto.

adjustably tilt said pipes as a unit. withinsaid enclosure, said air pipe communicating with. the.

end. to discharge. air thereinto and forming any air space about the fuel feed pipe insulating the, same from the heated air within the chamber.

5. In combination with a cement kiln. anda.

source of heated air fuel feed mechanism. com.- prising afuel'feed pipe adaptedjto direct-a stream. of fuel into the kiln, an enclosure surrounding the. discharge end of said. fuel feed pipe forming a. chamber thereabout communicating at oneend. with the kiln andcommunicating with .thesource. ofheated air to receive air from said. source. to.- pass through the chamber over the discharge end of the fuel feed pipe into the kiln, an air pipe extending through the wall of the enclosure telescopically surrounding the fuel feed pipe but spaced therefrom forming an air passageway therearound insulating thefuel feed pipe from the heated air within the chamber, means supporting said pipes operable to adjust the angular position thereof as a unit within the enclosure.

6. Fuel feed mechanism for discharging fuel into a combustion zone comprising, in combination with a kiln having a combustion zone, an enclosure communicating at one end with the kiln, a sleeve extending through the opposite end of the enclosure into the interior thereof, means supporting the sleeve for angular adjustment within the enclosure, an air pipe supported within the sleeve for angular adjustment as a unit therewith and extending therebeyond into the enclosure a fuel feed pipe of less diameter than said air pipe spacedly supported within the latter for angular adjustment as a unit therewith, and adapted to inject fuel into the combustion zone.

'7. Fuel feed mechanism for discharging fuel into a combustion zone comprising, in combination, a combustion zone, a fuel feed pipe adapted to direct fuel into the combustion zone, an enclosure surrounding the discharge end portion of the fuel feed pipe and communicating at one end with the combustion zone, means for directing highly heated air into the enclosure including means for heating the air thus directed, an air pipe communicating with a source of relatively cool air having an internal diameter greater than the external diameter of the feed pipe and telescoping that portion of the feed pipe within the enclosure providing an annular air passage therearound to shield the fuel feed pipe from direct contact with the highly heated air in the enclosure, said fuel pipe and air pipe being approximately coextensive in length within said enclosure, and means for axially shifting one of said pipes relative to the other to position the end of one pipe either short of or beyond the end of the other pipe.

8. Fuel feed mechanism for discharging fuel into a combustion zone comprising, in combination, a combustion zone, a fuel feed pipe adapted to direct fuel into the combustion zone, an enclosure surrounding the discharge end portion of the fuel feed pipe and communicating at one end with the combustion zone, means for directing highly heated air into the enclosure including means for heating the air thus directed, an air pipe communicating with a source of relatively cool air having an internal diameter greater than the external diameter of the feed pipe and telescoping that portion of the feed pipe within the enclosure providing an annular air passage therearound to shield the fuel feed pipe from direct contact with the highly heated air in the enclosure, said air pipe being mounted for axial adjustment relative to said fuel feed pipe, and means for axially adjusting said air pipe to vary the position of the end of the air pipe either short of or beyond the discharge end of the fuel feed pipe.

HARRY S. LEE. 

